Thanks for posting. Those photos are beautiful. I don't know much about bees, but more information about the red-tailed bumblebee (and how to encourage them) can be found here.
As for the other species, a useful bumblebee identification page can be found here. Please let me know how useful you find these website-I'd love to hear your feedback.
Hopefully someone will be along soon to tell you what kind of bee it is!